Charging base



FIG. 1 is a perspective view of the charging base showing our new design.

FIG. 2 is a front view of the charging base showing our new design.

FIG. 3 is a back view of the charging base showing our new design.

FIG. 4 is a top view of the charging base showing our new design.

FIG. 5 is a bottom view of the charging base showing our new design; and,

FIG. 6 is a perspective view of the charging base, shown in an environment of use.

The left and right views of the charging base are identical to the front view illustrated in FIG. 2.

The broken lines in the figures depict environmental subject matter that forms no part of the claimed design. 

CLAIM The ornamental design for a charging base, as shown and described. 